Units of dynamic range

Started 6 months ago | Discussions thread
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TN Args
TN Args Veteran Member • Posts: 7,354
Units of dynamic range

Hi everyone, I would like to get some clarification please.

I have seen dynamic range described using various units, as a number of EV, stops, dB, bits.

Firstly, are all those units legitimate units of dynamic range?

Also, are there any conversion factors?

  • 12 EV of dynamic range
  • 12 stops of dynamic range
  • 12 dB of dynamic range
  • 12 bits of dynamic range
  • 12=12=12=12?

Finally, does the appropriate unit vary with what is being measured?

  • the live scene in front of me has 12 (unit) of dynamic range
  • the sensor has 12 (unit) of dynamic range
  • the image has 12 (unit) of dynamic range
  • the PC monitor has 12 (unit) of dynamic range

As an aside, some PC monitors or video projectors seem to use a contrast ratio (like 5000:1) when they are describing what I would call the dynamic range. Can one convert from contrast ratio to EV / stops / dB / bits?

Thanks for any responses.

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